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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Per Share Operating Performance:    
Net asset value, beginning of year $ 20.87 $ 12.91
Total income (loss) 9.04 2.96
Total expenses (0.07) (0.03)
Net increase (decrease) in net asset value 8.97 2.93
Net asset value, end of year $ 29.84 $ 15.84
Total Return 42.98% 22.70%
Ratios to Average Net Assets    
Total income (loss) 33.60% 21.56%
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.31% 0.31%
Expenses waived   (0.16%)
Net expense excluding management fees 0.31% 0.15%
Net income (loss) 33.34% 21.34%